<!DOCTYPE html>
<html lang="zh-CN">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // let uname = prompt('请输入你的用户名')
    // let pwd = prompt('请输入你的密码')
    // if (uname === 'pink' && pwd === '123456') {
    //   alert('登录成功')
    // } else {
    //   alert('用户名或者密码错误')
    // }

    let year = +prompt('请输入年份')
    if (year % 4 === 0 && year % 100 !== 0 || year % 400 === 0) {
      alert(`${year}年是闰年`)
    } else {
      alert(`${year}年是平年`)
    }


  </script>
</body>

</html>